We are the 'salt of the earth'; the 'light of the world'

I believe this song and video are a great representation of Matthew 5:13-16 (KJV):

13) Ye are the salt of the earth: but if the salt have lost his savour, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men.
14) Ye are the light of the world.  A city that is set on an hill cannot be hid.
15) Neither do men light a candle, and put it under a bushel, but on a candlestick; and it giveth light unto all that are in the house.
16) Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.

The righteousness that we do to serve God through our good works is for the glory of God (Matthew 5:16).  When others persecute us for righteousness' sake, we are blessed by God (Matthew 5:10,11).  We are to rejoice and be glad (v. 12).

When we rejoice as the 'salt of the earth' and 'the light of the world' (vs. 13, 14), we keep our salt savory and our light shining to overcome evil.  God, our Father in heaven, will be glorified.